<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .nav a{
            color: #ffffff;
            font-weight: 700;
            width: 120px;
            height: 58px;
            background-color: royalblue;
            display: inline-block;
            text-decoration: none;
            text-align: center;
            line-height: 48px;
        } 

        .nav .bg1 {
            background: url("images/bg1.png") no-repeat;
        }
        .nav .bg1:hover {
            background-image: url("images/bg2.png");
        }


        .nav .bg2 {
            background:url("images/bg3.png")  no-repeat;
        }
        .nav .bg2:hover {
            background-image: url("images/bg4.png");
        }

        .nav .bg3 {
            background: url("images/bg5.png") no-repeat;
        }
        .nav .bg3:hover {
            background-image: url("images/bg11.png");
        }

        .nav .bg4 {
            background: url("images/bg22.png") no-repeat;
        }
        .nav .bg4:hover {
            background-image: url("images/bg3.jpg");
        }

        .nav .bg5 {
            background: url("images/bg11.png") no-repeat;
        }
        .nav .bg5:hover {
            background-image: url("images/bg4.png");
        }
    </style>
</head>
<body>
    <div class="nav">
        <a href="#"class="bg1">五彩导航</a>
        <a href="#"class="bg2">五彩导航</a>
        <a href="#"class="bg3">五彩导航</a>
        <a href="#"class="bg4">五彩导航</a>
        <a href="#"class="bg5">五彩导航</a>
    </div>
</body>
</html>